Is 3.5 hours of sleep enough?

Most adults are advised 7 to 9 hours. 3.5 hours is below that range. In the data, under 1% of people worldwide sleep less than that, so short sleep is at least common company.

How much sleep does the average person get?

Sleep Cycle users average 7 h 1 min a night worldwide. Finland leads at 7 h 17 min, Norway is close behind at 7 h 16 min, the United States gets 6 h 50 min and Japan the least at 6 h 17 min.

How rare is sleeping 3.5 hours?

Worldwide, about 1 in 9,084 people sleep 3.5 hours or less. In the United States it is 1 in 3,058, in Japan 1 in 741.

Is 3.5 hours of sleep normal?

under 1% of people worldwide sleep less than 3.5 hours a night, going by Sleep Cycle's app data. In the United States it is under 1%; in Japan, under 1%.

Percentile

<1%

of people worldwide sleep less than 3.5 hours

3.5 hours = 3 h 30 min

ShortMost sleep bodies (AASM, Sleep Foundation) recommend 7 to 9 hours for adults. This is under that.

3.5 hours by group

By country

Share of Sleep Cycle users sleeping less than 3.5 hours a night
Group	Mean	Sleep less than you	1 in X
World	7 h 1 min	<1%	1 in 9,084
Finland	7 h 17 min	<1%	under 1 in 10,000
Norway	7 h 16 min	<1%	under 1 in 10,000
Netherlands	7 h 16 min	<1%	under 1 in 10,000
Australia	7 h 4 min	<1%	under 1 in 10,000
Germany	7 h 1 min	<1%	under 1 in 10,000
India	7 h 1 min	<1%	1 in 9,084
United Kingdom	6 h 58 min	<1%	1 in 8,601
Brazil	6 h 58 min	<1%	1 in 3,842
France	6 h 53 min	<1%	1 in 5,349
United States	6 h 50 min	<1%	1 in 3,058
China	6 h 48 min	<1%	1 in 2,990
South Korea	6 h 22 min	<1%	1 in 1,348
Japan	6 h 17 min	<1%	1 in 741

Percentile is the share of the group sleeping less than this a night. “1 in X” counts the rarer side: people at or beyond this value above the median, at or under it below. Percentiles are estimated from a normal distribution with each country's mean and SD.

What this means

3.5 hours is 211 minutes less than the global mean of 7 h 1 min. In Norway, where the mean is 7 h 16 min, it is below the 1st percentile.
Against a 7 hour floor that is 210 minutes short a night, about 53 full days a year.
Sleep Cycle measures people who track their sleep with a phone on the mattress. That is millions of nights, from a group that cares enough to measure them.

Questions

Is 3.5 hours of sleep enough?: Most adults are advised 7 to 9 hours. 3.5 hours is below that range. In the data, under 1% of people worldwide sleep less than that, so short sleep is at least common company.
How much sleep does the average person get?: Sleep Cycle users average 7 h 1 min a night worldwide. Finland leads at 7 h 17 min, Norway is close behind at 7 h 16 min, the United States gets 6 h 50 min and Japan the least at 6 h 17 min.
How rare is sleeping 3.5 hours?: Worldwide, about 1 in 9,084 people sleep 3.5 hours or less. In the United States it is 1 in 3,058, in Japan 1 in 741.

Source: Sleep Cycle Annual Sleep Report 2023, app users who track their sleep; a large sample, not a random one. Percentiles on this page are our estimate from a normal distribution with the stated mean and SD.

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